83. Remove Duplicates from Sorte

没什么好说的，就是直接遍历，找到符合条件的删除

func deleteDuplicates(head *ListNode) *ListNode {
    cur := head
    for cur != nil && cur.Next != nil {
        if cur.Next.Val == cur.Val {
            cur.Next = cur.Next.Next
        } else {
            cur = cur.Next
        }
    }
    return head
}